Seems like my PCI-7344 has one axis faulty. Please help

[Giridhar_Rajan]

Hi all,

I have a PCI-7344 with UMI7774. I am trying to read the position of a encoder connected to Axis1. But when I move the encoder shaft, the counts dont change in LabVIEW or MAX. When I connect the same encoder to Axis 2,3 or 4 then the change in encoder counts occurs. When I press the "Test resources" button in MAX it says that "The device passed the resource test successfully !". What can be the reason? Does it mean that the UMI 7774 is faulty? What does "test resources" mean??

Regards,

Giridhar Rajan

Automation Engineer, Design

Cruiser Controls

Mumbai, India

[Jochen]

Giridhar,

"Test resources" only tests if the PCI-7344 is installed correctly in the PC by checking the communication resources that are assigned to the board. This is not a functional test of the board.

The problem that you see could be caused by a defective UMI-7774, PCI-7344 or the motion cable. If possible please exchange these components one by one with other components that you know that are working properly. I think the most probable reason for this behavior would be a defective UMI-7774 but there is also a small chance that one of the other components is broken.

Best regards,

Jochen Klier
National Instruments Germany

[Giridhar_Rajan]

Hi Jochen,

Thanks for the reply. I changed the motion cable and checked, but still no effect. This confirmed that the cable is fine. I'll try to get a loner for the UMI7774 from NI India and try. Thanks again.

Regards,

Giridhar Rajan

Automation Engineer, Design

Cruiser Controls

Mumbai, India